Picot-cutting attachment for sewing machines



April 15 1924. 1,490,803

J- DAVIS ET AL PICOT CUTTING ATTACHMENT FOR SEWING MACHINES Filed March 4 192G Izu/en 1201'. z/obn Dav is.

Pafiricb J 0 Zamora Patented Apr. 15, 1924.

HTE srr TES I is in JOHN DAVIS AND PATRICK J. O"CON1\TOR, OF CHICAGO, ILLINOIS.

PICOT-CUTTING ATTACHMENT FOR SEWING IVIACHIIIES.

Application filed March 4, 1920. Serial No. 363,255.

To all whom it may concern:

Be it known that we, JOHN DAVIS and PATRICK J. OCoNNon, citizens of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvements in Picot-Cutting Attachments for Sewing Machines, of which the following is a specification.

This invention relates to cutting attachments for over-edge or spoke stitch sewing machines, and its object is to provide a novel and improved cutter having a reciprocatory motion, and so constructed that it can be easily attached to or removed from the machine.

The object stated is attained by means of a combination and arrangement of parts to be hereinafter described and claimed, and in order that the same may be better understood, reference is had to the accompanying drawing forming a part of this specification.

In the drawing,

Figure 1 is an elevation showing the application of the invention with parts in section;

Fig. 2 is a perspective view of a throat plate;

Fig. 3 is a perspective view of the cutter detached, and Fig. 4 is a front elevation showing the pair of needles and the piercer therebetween.

Referring specifically to the drawing 10 denotes the cloth presser bracket secured by a screw 11 to the carrying bar 12, and provided with the usual rocking pressers 13 and 14 respectively. The needles 15 are carried by a bar 16, and the piercer 17 is carried by a bracket 18 secured by a screw 19 on the piercer bar 20. These are well known parts of a two-needle over-edge or spoke stitch sewing machine, and as nothing is claimed with respect thereto, a detailed description thereof is not deemed necessary. An example of this type of machine may be seen in Patent-s Nos. 1,098,003 and 1,025A 11 to Charles M. Abercrombie.

Instead of the scissors-like cutters shown in the Abercrombie patents referred to, a reciprocating cutter has been provided, the

same being a blade 21 having a shank 22 secured by a screw 23 to the piercer supporting bracket 18. The blade 21 is vertically positioned back of the piercer 17 and its length is such that it extends farther down than the piercer so that it may come. into contact with the cloth and, cut the same. The cutting edge of the blade is vertical with a'slight rearward incline, and as said blade is carried by the bracket 18, the vertical reciprocatory motion of the latter operates the blade to cut the cloth in the same manner as the pivoted scissors blades in the Abercrombie patents. The cutting device is very simple and it is efiicient and reliable in operation. The device can also be easily put on and taken off, and it is easy to handle as there is no interference and obstruction back of the presser foot as in the case with all scissors attachments. The blade comes in contact with the cloth only, and hence it will hold its edge longer than a pair of scissors or shear blades working together continually.

The throat plate 24L of the machine has a slot 25 through which the blade 21extends, and the depending rear portion 26 of the feed dog 27 has a vertical slot 28 to accommodate the blade as it descends.

We claim:

1. In a sewing machine, the combination with a stitch-forming mechanism including a reciprocatory needle bar carrying a pair of needles and a reciprocatory piercer bar carrying a piercer which is positioned between the needles; of a cutting blade carried by the piercer bar and having its cutting edge vertically presented to the work and positioned to the rear of the needies and the piercer.

2. In a hemstitching machine, a piercer bar carrying a piercer, a knife rigid with the piercer bar topartake of the movements thereof, said knife disposed in a vertical plane extending in the line of feed and passing through the piercer for severing the threads exposed by the spreading action of the piercer; together with a feed dog and throat plate below the presser foot of the machine, said throat plate and feed dog having registering slots affording clearance for said knife in its severing movement.

3. In a hemstitching machine, a piercer bar carrying a piercer, a knife rigid with the piercer bar to partake of the movements thereof, said knife disposed in a vertical plane extending in the line of feed and passing through the piercer for severing the threads exposed by the spreading action of the piercer.

4C. In a hemstitching machine, means to a throat plate and a feed dog below the presser foot of a knife movable with the movements of the piercer and disposed in a plane to sever the threads spread by the pierceijsaid throat plate and said feed dog having slots vertically registering With each other and affording clearance for the movements of said knife, said knife in itsvertical reciprocation operating in said slots.

In testimony whereof We afiix our signatures.

JOHN DAVIS. PATRICK OCONNO'R. 

